当<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_44141.png" alt="latex" />收敛时，
<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_bd1fc.png" alt="latex" />收敛．||
当<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_44141.png" alt="latex" />发散时，
<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_bd1fc.png" alt="latex" />发散．||
当<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_3cf51.png" alt="latex" />收敛时，
<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_74790.png" alt="latex" />收敛．||
当<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_3cf51.png" alt="latex" />发散时，
<img src="http://www.hskaoyan.com/latex/05ec4714/144750150_74790.png" alt="latex" />发散．